From It's Only Rock & Roll, the Rolling Stones European web site (iorr.org):

DVD distributor Image Entertainment will release 2-disc and 4-disc editions of "Hail! Hail! Rock & Roll", the Chuck Berry celebration masterminded by Keith Richards, on June 27. The 4-disc version will contain more than seven hours of new material, including jam sessions, extended interviews, and a conversation between Berry and Robbie Robertson in which Berry talks about his prison experiences for the first time.